February 12, 2019

Dear San Luis Valley Potato Growers,

Potato Certification Service

San Luis Valley Research Center

0249 East Road 9 North

Center, Colorado 81125

(719) 754-3496

fax (719) 754-2619

Attached, please find the 2018 Post Harvest Test (PHT) inspection results for certified seed potatoes. Read the disclaimer

preceding the list. This is a comprehensive list of all submitted seed lots passing Post Harvest Test tagging tolerances of

combined 5% total virus (including no more than 1.0% PVYN/NTN) as specified in the Colorado Seed Act and Colorado Rules

and Regulations for Certification of Seed Potatoes. If you purchased a seed lot prior to PHT results and it is not listed

here, contact your seed supplier for results.

This document is a listing of certified seed lots that are eligible for sale to the commercial industry. If the “2019

Eligibility” for a given seed lot be a pending designation, the 2019 eligibility status is still pending a lab test. Be

advised that the readings are an estimate only. Yield losses due to actual disease content may vary by variety and

management practices. Please call the Colorado Potato Certification Service with any further questions.

CERTIFIED SEED GROWERS and GROWER ENTRY Tier I and II GROWERS, PLEASE NOTE:

Seed lots planted for recertification or qualified lots for Tier I and Tier II growers must meet the re-certification

tolerances as defined in the Rules and Regulations:

Re-certification Tolerances All Generations

Disease % Leafroll 1.5 Total Mosaic Allowed 3.0

PVY(N/NTN) 1.0 Other Virus 0.5 Haywire 2.0 Spindle Tuber 0 Bacterial Ring Rot 0

Planting ineligible lots will disqualify your farming operation as fully certified. Call the Potato Certification Service

office if you have ANY questions.

pending PHT result pending lab test.

Not tested Only seed lots with visual mosaic symptoms ranging from > 1% to 5% Mosaic were serologically tested

for PVYN/NTN.

^^ Several cultivars listed identified in this document with ^^ are protected by US Patent, PVP Act, and material

transfer agreement, or subject to registration fees under owner/grower contracts. It is illegal to purchase non

certified seed of such cultivars. Buyers of any variety are advised to validate the status of the variety from the

vendor or variety owner.

* The grower’s lots listed passed all field inspection requirements and are approved as certified seed; however,

this grower had a lot(s) of seed potatoes in his farming operation rejected due to bacterial ring rot. Any seed lot

with an * in its designation shall not be eligible for re-certification the following year except by the original

grower or the farming operation where bacterial ring rot was identified. The * symbol will also be printed on all

of the grower’s tags and bulk certificates. (Note: for the 2018 crop, no bacterial ring rot was observed in the

certification program.)

Seed certification is made by the Colorado Potato Certification Service of Colorado State University (the “PCS”) pursuant

to Colorado law (CRS §35-27-101 et seq., as amended). “Certification” of any seed by the PCS means only that:

• the seed potatoes were visually inspected while growing in the field; and

• random samples of seed potato lots were again visually inspected at a post harvest test plot in accordance with

the Rules and Regulations for Certification of Seed Potatoes published by the PCS in cooperation with the

Colorado Certified Potato Growers Association; and

• based on such inspections, the seed potato lots listed here were found to be in compliance with the applicable

standards set forth in the Rules and Regulations.

Certification of any seed lot is not a guarantee or warranty that the certified seed lot is free from defects such as

disease, rot, or other condition that may affect seed quality and ability to sprout and grow normally.

NOTICE TO SELLERS AND BUYERS OF CERTIFIED SEED – DISCLAIMER OF WARRANTIES AND LIMITATION TO DAMAGES

Colorado State University and Colorado Potato Certification Service are not sellers of certified seed and make no

warranties, express or implied, of merchantability, fitness for a particular purpose or otherwise. In any event, liability

for damages, regardless of the form of action, will not exceed the purchase price paid for seed lots by the Buyer. In no

event will Colorado Potato Certification Service, Colorado State University, the Board of Governors, or their members,

officers, employees or agents, be liable for any consequential damages.